Vibratory structure, method for controlling natural frequency thereof and sensor and actuator adopting the vibratory structure
First Claim
1. A vibratory structure comprising:
- an elastic member one end portion of which is connected to a first support end and having an elastic force;
an inertial object vibrating by the elastic force of said elastic member;
a moving electrode attached to said inertial object;
an effective stiffness controlling electrode connected to a second support end; and
a power supplier generating electric force between said moving electrode and said effective stiffness controlling electrode, wherein said electric force linearly varies according to the displacement of said inertial object.
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Accused Products
Abstract
A vibratory structure and a method for controlling the natural frequency thereof are provided. The vibratory structure has an elastic member one end portion of which is fixed to a first support end, an inertial object for vibrating by the elastic force of the elastic member, a moving electrode attached integrally to the inertial object, an effective stiffness controlling electrode fixed to a second support end, and a power supplier for generating electric force between the moving electrode and the effective stiffness controlling electrode. The moving electrode and the effective stiffness controlling electrode are formed into a predetermined shape, so that the electric force varies linearly according to the displacement of the inertial object. Thus, the natural frequency of the vibratory structure is controlled by changing the voltage applied across the moving electrode and the effective stiffness controlling electrode.
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Citations
13 Claims
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1. A vibratory structure comprising:
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an elastic member one end portion of which is connected to a first support end and having an elastic force; an inertial object vibrating by the elastic force of said elastic member; a moving electrode attached to said inertial object; an effective stiffness controlling electrode connected to a second support end; and a power supplier generating electric force between said moving electrode and said effective stiffness controlling electrode, wherein said electric force linearly varies according to the displacement of said inertial object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for controlling the natural frequency of a vibratory structure comprising:
- an elastic member one end portion of which is connected to a first support end and having an elastic force;
an inertial object vibrating by the elastic force of said elastic member;
a moving electrode formed into a first predetermined shape and attached to said inertial object;
an effective stiffness controlling electrode connected to a second support end and formed into a second predetermined shape; and
a power supplier for generating electric force between said moving electrode and said effective stiffness controlling electrode,wherein said electric force linearly varies according to the displacement of said inertial object, and thus the natural frequency of said vibratory structure is controlled by changing the voltage applied between said moving electrode and said effective stiffness controlling electrode.
- an elastic member one end portion of which is connected to a first support end and having an elastic force;
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11. An actuator comprising:
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an elastic member one end of which is connected to a support end and having an elastic force; an inertial object vibrating by the elastic force of said elastic member; means for vibrating said inertial object and detecting the vibration of said inertial object; a moving electrode formed into fingers at one side of said inertial object; an effective stiffness controlling electrode formed into fingers to be inserted with said moving electrode; and a power supplier for applying a voltage to generate electric force between said moving electrode and said effective stiffness controlling electrode, wherein said electric force linearly varies according to the displacement of said inertial object.
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12. An actuator comprising:
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an elastic member one end portion of which is supported by a support end and having an elastic force; an inertial object formed into a plate, for vibrating by the elastic force of said elastic member and having at least one slit; means for exciting said inertial object and detecting the vibration of said inertial object; at least one effective stiffness controlling electrode formed into a plate, spaced from and parallel to said inertial object by a predetermined distance, and overlapping said inertial object in a portion having a triangle shape; and a power supplier for applying a predetermined voltage between said inertial object and said effective stiffness controlling electrode.
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13. An actuator comprising:
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an elastic member one end portion of which is supported by a support end and having an elastic force; an inertial object shaped into a circular plate and having at least one slit, for rotating by the elastic force of said elastic member; means for exciting said inertial object and detecting the vibration of said inertial object; and at least one effective stiffness controlling electrode spaced from and parallel to said inertial object by a predetermined distance, and overlapping said inertial object in a portion having a triangle shape.
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Specification